AbstractButton's checked default parameter not properly handled in PySide2

import pprint

from PySide2 import QtWidgets, QtCore
app = QtWidgets.QApplication([])

tb = QtWidgets.QPushButton("Press me!")

# Here, the callback will receive False, since clicked passes a boolean to the lambda.
tb.clicked.connect(lambda value="lambda with nothing": pprint.pprint(value))
# Here, the lambda will receive the default value from the checked parameter and NOT the one passed
# by the lambda
tb.clicked.connect(lambda checked=False, value="lambda with False": pprint.pprint((value, checked)))
tb.clicked.connect(lambda checked=True, value="lambda with True": pprint.pprint((value, checked)))

# Here, we get the same behaviour as with the three lambda's above.
def function_with_nothing(value="function with nothing"):
   pprint.pprint(value)
tb.clicked.connect(function_with_nothing)

def function_with_false(checked=False, value="function with False"):
   pprint.pprint((value, checked))
tb.clicked.connect(function_with_false)

def function_with_true(checked=True, value="function with True"):
   pprint.pprint((value, checked))
tb.clicked.connect(function_with_true)


# Those last two callbacks will generate an error when invoked, complaining that
# TypeError: <lambda>() missing 1 required positional argument: 'checked'
tb.clicked.connect(lambda checked, value="lambda with checked not set": pprint.pprint((value, checked)))

def function_with_checked_not_set(checked, value="function with checked not set"):
   pprint.pprint((value, checked))
tb.clicked.connect(function_with_checked_not_set)

# This works however.
def function_with_checked_only(checked):
   pprint.pprint(("Only checked as a parameter:", checked))
tb.clicked.connect(function_with_checked_only)


tb.show()

app.exec_()